Apache Commons Codec Source Code

Apache Commons Codec library provides implementations of common encoders and decoders such as Base64, Hex, Phonetic and URLs.

Apache Commons Codec Source Code files are provided in both binary packge (commons-codec-3.15-bin.zip) and source package (commons-codec-3.15-src.zip). You can download them at Apache Commons Codec Website.

Apache Commons Codec Source Code has no dependencies. You can compile it to generate your own version of Apache Commons Codec JAR file.

The source code of Apache Commons Codec 1.15 is provided below:

✍: FYIcenter

org/apache/commons/codec/binary/Base32OutputStream.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.codec.binary;

import java.io.OutputStream;

import org.apache.commons.codec.CodecPolicy;

/**
 * Provides Base32 encoding and decoding in a streaming fashion (unlimited size). When encoding the default lineLength
 * is 76 characters and the default lineEnding is CRLF, but these can be overridden by using the appropriate
 * constructor.
 * <p>
 * The default behavior of the Base32OutputStream is to ENCODE, whereas the default behavior of the Base32InputStream
 * is to DECODE. But this behavior can be overridden by using a different constructor.
 * </p>
 * <p>
 * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode
 * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).
 * </p>
 * <p>
 * <b>Note:</b> It is mandatory to close the stream after the last byte has been written to it, otherwise the
 * final padding will be omitted and the resulting data will be incomplete/inconsistent.
 * </p>
 * <p>
 * You can set the decoding behavior when the input bytes contain leftover trailing bits that cannot be created by a valid
 * encoding. These can be bits that are unused from the final character or entire characters. The default mode is
 * lenient decoding.
 * </p>
 * <ul>
 * <li>Lenient: Any trailing bits are composed into 8-bit bytes where possible. The remainder are discarded.
 * <li>Strict: The decoding will raise an {@link IllegalArgumentException} if trailing bits are not part of a valid
 * encoding. Any unused bits from the final character must be zero. Impossible counts of entire final characters are not
 * allowed.
 * </ul>
 * <p>
 * When strict decoding is enabled it is expected that the decoded bytes will be re-encoded to a byte array that matches
 * the original, i.e. no changes occur on the final character. This requires that the input bytes use the same padding
 * and alphabet as the encoder.
 * </p>
 * @see <a href="http://www.ietf.org/rfc/rfc4648.txt">RFC 4648</a>
 * @since 1.5
 */
public class Base32OutputStream extends BaseNCodecOutputStream {

    /**
     * Creates a Base32OutputStream such that all data written is Base32-encoded to the original provided OutputStream.
     *
     * @param out
     *            OutputStream to wrap.
     */
    public Base32OutputStream(final OutputStream out) {
        this(out, true);
    }

    /**
     * Creates a Base32OutputStream such that all data written is either Base32-encoded or Base32-decoded to the
     * original provided OutputStream.
     *
     * @param out
     *            OutputStream to wrap.
     * @param doEncode
     *            true if we should encode all data written to us, false if we should decode.
     */
    public Base32OutputStream(final OutputStream out, final boolean doEncode) {
        super(out, new Base32(false), doEncode);
    }

    /**
     * Creates a Base32OutputStream such that all data written is either Base32-encoded or Base32-decoded to the
     * original provided OutputStream.
     *
     * @param ouput
     *            OutputStream to wrap.
     * @param doEncode
     *            true if we should encode all data written to us, false if we should decode.
     * @param lineLength
     *            If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to
     *            nearest multiple of 4). If lineLength &lt;= 0, the encoded data is not divided into lines. If doEncode
     *            is false, lineLength is ignored.
     * @param lineSeparator
     *            If doEncode is true, each line of encoded data will be terminated with this byte sequence (e.g. \r\n).
     *            If lineLength &lt;= 0, the lineSeparator is not used. If doEncode is false lineSeparator is ignored.
     */
    public Base32OutputStream(final OutputStream ouput, final boolean doEncode,
                              final int lineLength, final byte[] lineSeparator) {
        super(ouput, new Base32(lineLength, lineSeparator), doEncode);
    }

    /**
     * Creates a Base32OutputStream such that all data written is either Base32-encoded or Base32-decoded to the
     * original provided OutputStream.
     *
     * @param ouput
     *            OutputStream to wrap.
     * @param doEncode
     *            true if we should encode all data written to us, false if we should decode.
     * @param lineLength
     *            If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to
     *            nearest multiple of 4). If lineLength &lt;= 0, the encoded data is not divided into lines. If doEncode
     *            is false, lineLength is ignored.
     * @param lineSeparator
     *            If doEncode is true, each line of encoded data will be terminated with this byte sequence (e.g. \r\n).
     *            If lineLength &lt;= 0, the lineSeparator is not used. If doEncode is false lineSeparator is ignored.
     * @param decodingPolicy The decoding policy.
     * @since 1.15
     */
    public Base32OutputStream(final OutputStream ouput, final boolean doEncode,
                              final int lineLength, final byte[] lineSeparator, final CodecPolicy decodingPolicy) {
        super(ouput, new Base32(lineLength, lineSeparator, false, BaseNCodec.PAD_DEFAULT, decodingPolicy), doEncode);
    }

}

org/apache/commons/codec/binary/Base32OutputStream.java

 

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